One thing I've never been able to figure out is how people use the bootstrap UI framework but then connect it up to a backend database/application.
Bootstrap framework is just for frontend content and it is easier to find lots of bootstrap based template for cheaper price this days which look very attractive and also responsive in all types of browser and media screens. Connecting to backend is just as simpler as connecting any other html based template with backend/database.
I think most of the projects use this to make their platform look professional as well as viewable in all types of browsers and devices.